Well, wonder of wonders, I got some writing done today!
Now the bad news.
The section I was working on, that I was just certain was the first part of Chapter 16, really is. The section I wrote months ago that I was just certain was the second part of Chapter 16, is not. That section is actually being promoted to a full chapter in its own right, and I've come up with another second half for poor Chapter 16.
And, while I was at it, and my outline was already screaming for mercy, I rearranged the order of chapters 16-19.
Trust me, it all makes sense in my head. No, really. No, REALLY. Why are you laughing?